JP2007219058A - Rear projection type screen and display medium using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen with high resolution that shows less flickers on the screen and is gentle for visual sense by configuring that a light diffusing sheet or a Fresnel lens sheet constituting a rear projection type screen absorbs UV rays from a light source and emits visible light, and thereby, the screen emits incoherent light and can suppress scintillation. <P>SOLUTION: The rear projection type screen comprises a light diffusing sheet which comprises, at least a lens sheet in an observer's side having a lens group having a function of directional diffusion, a light shielding layer, and a light transmitting base having non-directional diffusion, and a Fresnel lens sheet having a prism lens shape disposed in a light source side in the light diffusing sheet, wherein either the light diffusing sheet or the Fresnel lens sheet contains a material which absorbs UV rays to emit visible light. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rear projection screen used for a rear projection television or the like and a display medium using the same.

  A rear transmissive screen for rear projection television is generally configured by a combination of a light diffusing sheet disposed on the viewer side and a Fresnel lens sheet positioned on the light source side. A Fresnel lens sheet in which unit lenses are concentrically arranged serves to emit projection light from a small projector called an engine as parallel light to the light diffusing sheet. The light diffusing sheet spreads the projection light, which is made substantially parallel light by the Fresnel lens sheet, in a specific direction due to the characteristics of a cylindrical lens group arranged in parallel in a specific direction, and works to be emitted as display light to the observer side. is there.

The rear projection television uses a high-resolution small projector for the engine, and the screen is required to faithfully reproduce the projected high-definition image.
As a lamp that is a light source of an engine, a metal halide lamp, a high-pressure mercury lamp, or the like is mainly used. Unlike light such as a fluorescent lamp, these lights are light having the same phase and interfere with each other. For this reason, the image displayed on the screen has a lot of screen glare called scintillation, which causes eye fatigue, image flicker, and the like, and it is difficult to faithfully reproduce the image.

  In the present application, it is known that scintillation is reduced from the side surface of the screen using a technique as disclosed in Patent Documents 1 to 3, for example. These methods use the fact that scintillation and resolution are in an offset relationship and deal with blurring the video. However, the scintillation is reduced and the resolution is lowered at the same time, so it cannot be said that the high-resolution video is faithfully reproduced.

Patent documents are as follows.
Special Table 2003-533713 JP 11-38512 A JP 2000-275742 A

  The present invention has been made in consideration of the above technical background, and either the light diffusion sheet or the Fresnel lens sheet constituting the rear projection screen absorbs ultraviolet rays from a light source and emits visible light. An object of the present invention is to provide a high-resolution screen that can suppress scintillation by emitting light that is not in phase, has little screen flicker, and is easy on the eyes.

According to the present invention, in order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that at least the observer side has a lens group having a directional diffusion function, a lens sheet having a light shielding layer, and further non-directional diffusion. In a rear projection type screen consisting of a light diffusing sheet composed of a translucent substrate and a Fresnel lens sheet having a prism lens shape arranged on the light source side from the light diffusing sheet,
A rear projection screen characterized in that either the light diffusion sheet or the Fresnel lens sheet has a material that absorbs ultraviolet rays and emits visible light.

The invention according to claim 2 is a light diffusion sheet comprising a lens group having a directional diffusion function at least on the viewer side and a lens sheet having a light shielding layer, and a translucent substrate having non-directional diffusion, A rear projection having a material that emits visible light, wherein either the light diffusing sheet or the Fresnel lens sheet absorbs ultraviolet rays. On the mold screen,
2. The rear projection type screen according to claim 1, wherein the visible light to be emitted is fluorescent light.

The invention according to claim 3 is a light diffusion sheet comprising a lens group having a directional diffusion function at least on the viewer side and a lens sheet having a light shielding layer, and a translucent substrate having non-directional diffusion, A rear projection having a material that emits visible light, wherein either the light diffusing sheet or the Fresnel lens sheet absorbs ultraviolet rays. On the mold screen,
3. The rear projection screen according to claim 1, wherein the visible light to be emitted is light that is not in phase.

The invention according to claim 4 is a light diffusion sheet comprising a lens group having a directional diffusion function at least on the viewer side and a lens sheet having a light shielding layer, and a translucent substrate having non-directional diffusion, A rear projection having a material that emits visible light, wherein either the light diffusing sheet or the Fresnel lens sheet absorbs ultraviolet rays. On the mold screen,
The rear projection screen according to any one of claims 1 to 3, wherein at least one material that absorbs ultraviolet rays and one or more materials that emit visible light are contained.

The invention according to claim 5 is a light diffusing sheet comprising a lens group having a directional diffusion function at least on the viewer side and a lens sheet having a light shielding layer, and a translucent substrate having non-directional diffusion, A rear projection having a material that emits visible light, wherein either the light diffusing sheet or the Fresnel lens sheet absorbs ultraviolet rays. On the mold screen,
5. The ultraviolet ray absorbing material contained in either the light diffusion sheet or the Fresnel lens sheet, and having an ultraviolet absorbing substance on the viewer side from a material emitting visible light. This is a rear projection screen.

The invention according to claim 6 is a light diffusion sheet composed of a lens group having a directional diffusion function at least on the viewer side and a lens sheet having a light shielding layer, and a translucent substrate having non-directional diffusion, A rear projection having a material that emits visible light, wherein either the light diffusing sheet or the Fresnel lens sheet absorbs ultraviolet rays. On the mold screen,
The engine used in combination with the rear projection screen is a display medium used in combination with the rear projection screen material, which emits ultraviolet rays instead of the light emitted.

  Either the light diffusing sheet or Fresnel lens sheet constituting the rear projection screen absorbs ultraviolet rays from the light source and emits visible light, thereby suppressing the scintillation by emitting light that is not in phase. It is possible to provide a high-resolution screen with little flickering on the screen and easy on the eyes.

Hereinafter, an embodiment as a preferred example of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a light diffusion sheet in the present invention.
A rear projection screen (12) having a configuration in which a light diffusion sheet (10) is arranged on the observer side and a Fresnel lens sheet (11) is arranged on the light source side, and an engine (13) for projecting image light onto the screen The form comprised by this is shown.
The rear projection type screen and the display medium of the present invention are not limited to the configuration described above.

  In the present invention, the term “ultraviolet light” refers to light having a wavelength of 400 nm or less, and includes UV-A (315 to 400 nm), UV-B (280 to 315 nm), and UV-C (100 to 280 nm), which are wavelengths of 100 nm or more. Point to. In addition, when it is effective even in a shorter wavelength than that, it shall include those wavelengths. Visible light means light having a wavelength region of 400 nm to 700 nm.

  As a material that absorbs ultraviolet rays and emits visible light, other image light is visible light, and therefore, a colorless material is preferable, and a material that does not leave an afterimage when a moving image is projected is preferable. Therefore, the material used is preferably a fluorescent light emitter.

  When the material that absorbs ultraviolet rays and the material that emits visible light are the same, the energy obtained by absorbing the ultraviolet rays is fluorescently emitted and used repeatedly.

  The material that absorbs ultraviolet light and the material that emits visible light are not necessarily the same. If the material that absorbs ultraviolet light and the material that emits visible light are different, the material that absorbs ultraviolet light must absorb ultraviolet light. This energy returns to its original state by moving to a material that emits visible light, and the material that emits visible light that has received energy emits fluorescence when returning to its original state.

  The above materials can also be used in the form of being added as a new component to each component constituting the screen, by applying an ink or applying a film. However, it is required that the materials contributing to each color are not in a mixed state so that they do not affect each other.

  The base of the translucent substrate is preferably highly light transmissive, and organic materials such as acrylic resins, polycarbonate resins, styrene resins, acrylic / styrene copolymer resins and the like are preferable. An inorganic material containing silicate as a component can also be used.

  When a light diffusing agent is used to impart omnidirectional diffusion, alumina, silica, silicate, etc. for inorganic systems, acrylic resins, styrene resins, polycarbonate resins, styrene resins, acrylics for organic systems / Styrenic copolymer resin is suitable, and it is necessary to consider optical characteristics such as a difference in refractive index from the base, dispersibility when molded as a light diffusing plate, brittleness when molded, and the like. Furthermore, the translucent substrate is produced as a screen by sticking or adhering to the lens sheet, but if the surface of the translucent substrate is rough, an adhesive or an adhesive gun may be mixed into the adhesive surface. Those with low surface diffusion are desirable.

  The translucent colorant is preferably a dye, pigment, carbon, metal salt, metal oxide, or the like as a colorant capable of absorbing visible light, and is visible by containing any visible light absorbing material that absorbs a selected wavelength. The amount of light absorption in the region can be increased, and external light reflection can be reduced and contrast can be improved.

  As the antistatic agent, a general-purpose antistatic agent can be used regardless of the ion conduction type or the electron conduction type.

  Moreover, the said material is not specifically limited.

It is preferable to provide the light shielding layer other than the opening that serves as a path for light, and it is preferable that the ratio of the light shielding layer is higher. It is possible to form a light-shielding layer made of a black paint and having an external light absorption effect by a technique such as a molding method using photolithography, roll coating, screen printing, and transfer printing. By providing the light shielding layer, the necessary image light can selectively pass through the opening, so that the brightness is hardly reduced, and unnecessary external light can be blocked by the light shielding layer, so that high contrast can be achieved. I can do it.
Moreover, the said shaping | molding method is not specifically limited.

  As a light diffusing sheet, when a lens group for imparting directional diffusion is molded with an ultraviolet curable resin or an electron beam curable resin, the transparent support is preferably a transparent resin film having ultraviolet transparency. The surface on which the part is formed is preferably subjected to an easy adhesion treatment. Examples of the material include a polyester film, a polycarbonate film, and an acrylic film.

Further, the lens group can be molded integrally with the transparent support by molding using a stamper or the like. In this case, as an organic material, for example, an acrylic resin, a polycarbonate resin, a styrene resin, a thermoplastic resin such as an acrylic / styrene copolymer resin, or an inorganic material containing silicate as a component can be used.
Moreover, the said shaping | molding method and material are not specifically limited.

  For example, a benzophenone-based, benzotriazole-based, acrylate-based, saturate-based, or nickel complex is used as an ultraviolet absorber, and is usually added to prevent deterioration due to light. A substance that absorbs ultraviolet rays and emits visible light fluorescence is added to suppress the reaction with ultraviolet rays from outside light. Accordingly, unnecessary light emission does not occur due to ultraviolet rays from outside light, and it is possible to faithfully reproduce an image. Moreover, the said material is not specifically limited.

  The present invention does not correspond to all of the three primary colors of light, red (R), green (G), and blue (B). For example, the phase of only G with particularly high visibility can be made irregular. There is a scintillation suppression effect.

  When the rear projection type screen of the present invention is used, an increase in cost can be suppressed by using ordinary engine optical systems and lamps. The screen of the present invention can be used by utilizing the ultraviolet rays possessed by the lamp. For example, it is desirable to use a mechanism that emits ultraviolet rays according to the material using a filter or the like.

It is the schematic diagram which showed an example of the display medium using the rear projection type screen of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Light diffusion sheet 11 ... Fresnel lens sheet 12 ... Rear projection type screen 13 ... Engine

Claims (6)

A light diffusing sheet comprising a lens group having a directional diffusion function at least on the viewer side, a lens sheet having a light shielding layer, a translucent substrate having non-directional diffusion, and a light source side from the light diffusing sheet. In a rear projection type screen composed of a Fresnel lens sheet having a prism lens shape to be arranged,
A rear projection screen characterized in that either the light diffusion sheet or the Fresnel lens sheet has a material that absorbs ultraviolet rays and emits visible light. A light diffusing sheet comprising a lens group having a directional diffusion function at least on the viewer side, a lens sheet having a light shielding layer, a translucent substrate having non-directional diffusion, and a light source side from the light diffusing sheet. In a rear projection type screen comprising a Fresnel lens sheet having a prism lens shape to be disposed, and either the light diffusion sheet or the Fresnel lens sheet absorbs ultraviolet rays and has a material that emits visible light,
2. The rear projection screen according to claim 1, wherein the visible light to be emitted is fluorescent light. A light diffusing sheet comprising a lens group having a directional diffusion function at least on the viewer side, a lens sheet having a light shielding layer, a translucent substrate having non-directional diffusion, and a light source side from the light diffusing sheet. In a rear projection type screen comprising a Fresnel lens sheet having a prism lens shape to be disposed, and either the light diffusion sheet or the Fresnel lens sheet absorbs ultraviolet rays and has a material that emits visible light,
3. The rear projection screen according to claim 1, wherein the visible light to be emitted is light that is not in phase. A light diffusing sheet comprising a lens group having a directional diffusion function at least on the viewer side, a lens sheet having a light shielding layer, a translucent base material having non-directional diffusion, and a light source side from the light diffusing sheet In a rear projection type screen comprising a Fresnel lens sheet having a prism lens shape to be disposed, and either the light diffusion sheet or the Fresnel lens sheet absorbs ultraviolet rays and has a material that emits visible light,
The rear projection screen according to any one of claims 1 to 3, wherein the rear-projection screen includes at least one material that absorbs ultraviolet rays and at least one material that emits visible light. A light diffusing sheet comprising a lens group having a directional diffusion function at least on the viewer side, a lens sheet having a light shielding layer, a translucent base material having non-directional diffusion, and a light source side from the light diffusing sheet In a rear projection type screen comprising a Fresnel lens sheet having a prism lens shape to be disposed, and either the light diffusion sheet or the Fresnel lens sheet absorbs ultraviolet rays and has a material that emits visible light,
5. The ultraviolet ray absorbing material contained in either the light diffusion sheet or the Fresnel lens sheet, and having an ultraviolet absorbing substance on the viewer side from a material emitting visible light. Rear projection screen. A light diffusing sheet comprising a lens group having a directional diffusion function at least on the viewer side, a lens sheet having a light shielding layer, a translucent base material having non-directional diffusion, and a light source side from the light diffusing sheet In a rear projection type screen comprising a Fresnel lens sheet having a prism lens shape to be disposed, and either the light diffusion sheet or the Fresnel lens sheet absorbs ultraviolet rays and has a material that emits visible light,
The engine used in combination with the rear projection type screen emits ultraviolet rays instead of the light emitted from the rear projection type screen material, and is used in combination with the display medium.

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